Angular 6 - can Deactivate Guard not working

I'm having trouble getting Can Deactivate to work in my application. In the form file.component.html I have the following code:

       <div class="form-group">
        <label for="quoteType">Quote Type</label>
        <select class="form-control" id="quoteType" name="QuoteType" #type (change)="getQuoteType(type.value)">
          <option selected="selected">---</option>
          <option value="New">New</option>
          <option value="Amendment">Amendment</option>
          <option value="Migration">Migration</option>
          <option value="Replacement/Renewal">Replacement/Renewal</option>
        </select>
      </div>

      <div [ngSwitch]="quotetype">
        <div *ngSwitchCase="'New'">
          <app-form-new [quotetype]="quotetype"></app-form-new>
        </div>
        <div *ngSwitchCase="'Amendment'">
          <app-form-amendment [quotetype]="quotetype"></app-form-amendment>
        </div>
        <div *ngSwitchCase="'Migration'">
          <app-form-migration [quotetype]="quotetype"></app-form-migration>
        </div>
        <div *ngSwitchCase="'Replacement/Renewal'">
          <app-form-replacement-renewal [quotetype]="quotetype"></app-form-replacement-renewal>
        </div>
      </div>

Depending on what I select will render a different component in this template. In this case I will select "New"!

Image before selecting:

After New is selected:

What I want is: if the user starts filling out the form and unintentionally or on purpose press the back button to the previous page, a message appears asking if he really wants to do this.

I manage to do on other pages of this system, but when I go to these forms it does not work out. Below follows the code I made so far.

new-can-deactivate-guard.service.ts

import { Injectable } from '@angular/core'
import { CanDeactivate } from "@angular/router";
import { FormNewComponent } from './form-new.component'

@Injectable({
    providedIn: 'root'
})
export class FormNewCanDeactivateGuard implements CanDeactivate<FormNewComponent> {
    canDeactivate(component: FormNewComponent): boolean {
        if(component.formNew.dirty) {
            return confirm('Are you sure you want to discard your changes?')
        }

        return true
    }
}

Route file:

export const ROUTES: Routes = [

    { path: '', component: TelaAcessoComponent },

    { path: 'homepage', component: HomepageComponent, children: [
        { path: '', component: QuotesAbertasComponent},
        { path: 'quotes-abertas', component: QuotesAbertasComponent},
        { path: 'quotes-fechadas', component: QuotesFechadasComponent},
        { path: 'quotes-qss', component: QuotesQssComponent},
    ] },

    { 
        path: 'quotes-abertas/:id', 
        component: QuotesAbertasDetalhesComponent,
        canDeactivate: [QuotesAbertasCanDeactivateGuard]
    },

    { 
        path: 'quotes-fechadas/:id', 
        component: QuotesFechadasDetalhesComponent,
        canDeactivate: [QuotesFechadasCanDeactivateGuard]
    },

    {
        path: 'quotes-qss/:id', 
        component: QuotesQssDetailsComponent,
        canDeactivate: [QuotesQssCanDeactivateGuard]
    },

    { path: 'formulario', component: FormularioComponent },

    { 
        path: 'formulario-New', 
        component: FormNewComponent, 
        canDeactivate: [FormNewCanDeactivateGuard]
    },

    { path: 'formulario-Amendment', component: FormAmendmentComponent },
    { path: 'formulario-Migration', component: FormMigrationComponent },
    { path: 'formulario-Renewal/Replacement', component: FormReplacementRenewalComponent },
    { 
        path: 'products/:id', 
        component: ProductsComponent,
        canDeactivate: [ProductsCanDeactivateGuard]
    },
]

Can anyone help me run this route guard on this page?